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if a 1500kg car is driven in sand at 5m/s, the coefficient of rolling friction is 0.06. In this case nearly all of the energy the car uses to move goes to overcoming rolling friction, so air drag can be ignored. What is the propulsion force need tot keep the car moving forward at a constant speed?
A 1328.0 g mass is on a horizontal surface with μk = 0.32, and is in contact with a massless spring with a force constant of 550.0 N/m which is compressed. Calculate the distance the spring was compressed
One resistor dissipates 12 W of power when connected across a battery. how much total power will they dissipate
A family goes on vacation for one week, but forgets to tun off an electric fan that consumes electricity at the rate of 200 Watts. how much does it cost to run the fan during this time
An electron close to a large, flat sheet of charge is repelled from the sheet with a 2.2pN force. Find the surface charge density on the sheet
Hail comes straight down at a mass rate of m/?t = 0.070 kg/s and an initial velocity of v0 = -13 m/s and strikes the roof perpendicularly. Unlike rain, hail usually does not come to rest after striking a surface. Instead, the hailstones bounce off..
An Australian emu is running due east in a straight line at a speed of 17.6 m/s and slows down to a speed of 15.7 m/s in 7.7 s. Assuming that the acceleration remains the same, what is the bird's velocity after an additional 2.0 s has elapsed?
A 2.30×103 ? resistor and a capacitor are connected in series and then a 12.00 V potential difference is suddenly applied across them. Calculate the time constant of the circuit
A 17-kg sled is being pulled along the horizontal snow-covered ground by a horizontal force of 32 N. Find the coefficient of kinetic friction between the runners of the sled and the snow
80 cm3 of water takes 12 min to cool from 40?C to 15?C in a draft; it is contained in a copper calorimeter of mass 150 g, Calculate the specific heat of the suspension in SI units
A source of electromagnetic waves radiates power uniformly in all directions at a single frequency. What is the average power radiated by the source
Find the charge on sphere A. How far from the dog will the suitcase land.
A 30 kg child rides a 9 kg sled down a frictionless ski slope. At the bottom of the hill, her speed is 7 m/s. If the slope makes an angle of 15° with the horizontal, how far did she slide on the sled?
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